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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c783b0ca23df5e0f70791063976c67344ac54bd56fe6d1fff104b66072004e7' 
  AND token = 'tmpNQBwo9m0O53rPQ/vw7ierPWpbOINDBzZY6b/TBBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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