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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b16e387ab499dc6464006b22d2c9a6b0f363588ff8207008e680ad436d15add4' 
  AND token = 'xTVCqtwbqtpNLW1CHG9DbtBXvP422HfakWP+khHGSQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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