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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4898f49e3985e83d8e48f8eaccb34643b90fedfb7e8eb84873fc91d3857bf42f' 
  AND token = 'yE+HG2wNbGzadsbnCyEJKG19LIbPaqMH6cbawF3F3/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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