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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c1f9c1a03905f3223d3c23a91662f73342059c272ecb57538b1eb68ded9bda' 
  AND token = 'tR7LnlLh0ceI9upQSKk20p98c5qVTOO2cQtMtTX8+hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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