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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884e02d9958e3cf5c6e450bbccbad89a82028866eb348144796d97a34df0887c' 
  AND token = 'RQDxc3rp8DYNEz0DMuVWfsfBor949k/Q6N6teAIjnx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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