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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760a6f83591c6b5f44b51632caab85aae433737f4f5d101469e8984c361e7f67' 
  AND token = 'xbVnSHvkWlV3ve+vv97rJPO/EqpvlEpeJg5eZiGzVV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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