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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78d1ba64fd2d2cd2755b8d523139abaae7ca2641d67458ddb5745590594033ee' 
  AND token = '9hr6K3tlXc0DAGrWwb5pn0KhuMf+o2m+l1x6sVhP9Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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