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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da98092996dccc987a8e2cc95208295f1a2b19d49fb15b38989bd015ba4669d' 
  AND token = 'x+W6Wyl2Vm+JU7xWz7RbOCw7IbE1yLBtqMbOwZJmIPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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