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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74f838d79baa9226aa38d7cf66daa7e513e1039ff604dc890569d5a84da8d59' 
  AND token = 'tY/U8GVpw4KUqQ+uGqqkBXKae1eTr0R8UQXnhfW+Nm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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