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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3d74cbdf56b4c646764d6f76fe8c770b1fe915db22c143c5139202cbc1114b' 
  AND token = 'eGdsY518nPrzTBYpXoM6w62R8/TDpRdqS6ytQhZOXbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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