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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df627abeab88042c7723ced83e1668c02629de5472994cd284a91d7c0cab1ed2' 
  AND token = 'Tmam3S51PRIsqs29YUheDUyvXfyk0LTlBG268iONOs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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