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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '813cc70a54dcd8b980ad218d67257fa9907401ab08287300ede5f27c2c089700' 
  AND token = 'gZeKnvg98b8nIKUjOC1UojC7HQ7rCDf0SMLR8+KvUII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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