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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed2556eca2cb2610e1a7924d755f56a8123afc0620eb56b431ece5a5240ab40' 
  AND token = '8AiP6V/gGWxYq2g2W1ihn5HkGEB64VVBq8Q+T+M2m9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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