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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fea3882a8b00f393ef1a1db872c4e99b2eb20202e7f0e4f7b5d8a6386430be8' 
  AND token = 'nKTw5vNxPNjtR10hC23ItrpNvSBjTGXpLoGI821+1+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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