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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011e59bfcaa0c80f85e875c19f2fb354620eb74befaa7840f5cb4a3567c75bec' 
  AND token = 'IIfVx1yvhUhfAAymu0Du6nmU2N1ZtIaGOwsqh0rHr/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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