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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd438899d51db1385787c99a462f8aa67de16503049eb2f54ce404259de4eea18' 
  AND token = 'yZa1AbCzaSf2pDC7LipI1yBEc60aCAJQQGD7fAofDKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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