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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48069ac2f820fd185807fae9cc998ef0eb15cc436b36ed634619ad858cca832' 
  AND token = 'FKIY01IypGs3TN9qlT7YzRspOu6eeVIbNOkuphMtk8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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