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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b24edd86b12c907c0e6e266f9251e388f2c509274bd6c20fdfae909bd109763' 
  AND token = 'L7GD9KiK1NUoUOvayHn4GcKY/uFb+HQGKOgtjVF9RXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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