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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34fee77996fdea3563c850d126e62986b375995c869cb47a5ade977dba500ca' 
  AND token = 'rgkIDv7yLyPy7FV03QNe1pLpN1FVSHJ8D6W7f8QIX20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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