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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc0a28d687e655712ebd803a1f78f21f3284811c99688d3611d4d2f54e98152' 
  AND token = 'ZVopxWStrXf3iVdR1IZXWAZlnjbkeX6nn3P01DA2m8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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