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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170730b40febde81f58be73ab7323ec7fd3695abf4c0bb5223cabbc14e3dabf9' 
  AND token = 'gHVclxwz4fanGCnxhAdyA9KBI3ZbcZBLp0aK563kBnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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