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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670509c7471ec1112ceae11ba3f7394a1f0314982f0ce2c6952ad980bdbf3630' 
  AND token = 'l9pf/ozOK8QfketFNn7vVIWSnAzcqG5obUO7DVmWDEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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