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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ca975a92ad695a8cdb2409623305127a55899b7af46eca6723c939e8640d71' 
  AND token = 'dRgdQ8PGJJ1IKd6BkPgfo/E6VL9t3940ypvNQzSaec0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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