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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10ec2744c0e21abbff4894a7a073d1f44c519f6c3650d126eacffe5e56bd718d' 
  AND token = 'VL6DS6h9XBdrGJzAa7791Q89TJeD/YyitjLNHIVF58M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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