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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a575f6897d49f1b6fa9658e74a157687eb1f6e28dba264fc526de4c67eaaaeda' 
  AND token = '/w5eT08VxMsm6iGzeoH6jM+ISLmQNu31lA2X11vJZkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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