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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be4ab838f8bd5c0bd5d30689c7d2968d9e17cdf26a16b90c7459c9251fdb08e3' 
  AND token = 'sV726/2Q8J+SA4SQBRfJvpLPI99YGs25iu4ohYO0bk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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