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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40efef0cd6c30718dc8040d119532080741214b22f1374a89302c5c4987e145b' 
  AND token = 'oxlHE/HI/fnmXA3vnOq7dwadaJuZ04VZZsD0GdHf/kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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