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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01e499561879c8a382107036a0244e9c5bfed1d260f55ff86b56701a198be55' 
  AND token = 'klyoatFUf0TcpCWEEWJdX8trHT7qMbU/2p401L7pD+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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