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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d30190f944759f08197b5ca77338c038eab789294e2eb9b6b49f5cb1098249a' 
  AND token = 'S8t/6rybAWEThYz509jFAgPfDhuTocSzOu3pSoX7bc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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