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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dda013689aaef909ed791504e3ad14847b2593268063924bb8c9871f853c124' 
  AND token = 'czMsi6z+0nLku4w3Tzozj/vGs4ll2+KLi9NtWc9tJts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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