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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c064c2274f28e5a0d419e1ae55cb9c0d3c941a7b0dc6ffad611b9ad5bef4a32' 
  AND token = 'jts1yCVEGK2xWOEyvL16nV8fQE5PlK7b+euYpjz/nX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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