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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef3c72aeb34c8209c719b5c1a67df50f4d2faf60cddbe426d8bf8eef71b8369' 
  AND token = '59rK/4fPkjM4TzPoMfv1jFuE8zAwKiKF43qLLSEB3VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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