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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1837818181efb91d329704b68b21a615a5e6c9733454e1833ca8fd91abc8244a' 
  AND token = 'fl4R4iY2Pi6/sokOrr+ZLnC4+9bQii9GMBTrWNQKXXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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