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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef479ec12f100e69e0680cf8d8190330aaabb566f7863c41e5a3835ca6a5ecf2' 
  AND token = 't5FWBcv8R8MPsES0GJy8GIzkJz+k7lpFFD/QYYLI/tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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