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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73bd4f90d04d4f4cdb802ea20b6921af8e195e3e5a0dc08ccefdf42493560826' 
  AND token = 'BgmgNokmC8frl/vUSdgOTuYbIYEalUdYIGBkLhmQWQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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