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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ae11c4d4f7e5e8836e109a33207570b9de29bddd03a8684815403fa2dae1d2' 
  AND token = 'cc/c+ItSHSM+pV/Yw1aibH4GC2a7kz5HGJg6bSwNbj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}