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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e39bb1a6938c3659d44c010f8a7ea11d6d02f93d98e122b47743ec0ebd6b9e73' 
  AND token = 'YvYjVcz8wBBMhoTr9C0LVZ/Q6b6FdSyE35BE5AO8NEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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