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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa0327a182a4b26fa43093a6cc359f09f176827f28e2bf38f63e81659d44ffd' 
  AND token = '64elXUCfgwVUfka3XN4n+qBdwHu95xhaYYIcYUToKYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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