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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a474a0656e8b9c7d22cd8020a43c59371864d9d2e6e554ac8e380652d5dbe1b3' 
  AND token = 'Eq+RXr/GmoCBximPlPzViaKv22MNnI4qN7Ym+xj5YIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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