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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ebfd74bf4c73f591df80d13e77e42c0c5773b80f0671358308bc2e2071a6f2e' 
  AND token = 'y/Hp1tz+o+hn7nnDaDYFd6bPg52oQJ6DJhATqOkXIwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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