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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ecd041f04a3fc3541026ba756efdc554988e2421dbb1f63025bb1198e94e11' 
  AND token = 'cYRFlrfWgXkqkZ2nOJZ1w+3rhrlD8PwqfPwbyEvnsnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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