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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b5f8bbaf6d56f1083c80e9c9be76396a41db8ae724688b3dde9fc1647dfbb3' 
  AND token = 'lUvnqw5orPmxli4mse40k4XEQGBmjHYo5G+Jj02bmnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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