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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27b99c2eaf28aa921e3491ec9bf6b075396a6dccda18b7741fdbef5cacdd2685' 
  AND token = 'pv6KKXdnD/i5WC8M7m4+Uz+k5i3Oxk2y9PrGWtpIB1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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