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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8124a81b3556aec1bfa291c7ccd36563fdafdab232b115b35bdaa9be5f0662' 
  AND token = 'q15LiBRknidpoe89VjJkfwlV+ymi6eApch8Ts0dI7kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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