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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '982cf4f07d3afb6b693404b6e8b56a6e5c863e16c7756609896c04b8ea92935f' 
  AND token = '1SKLz2PmDklYM9UXL+LdU6y1pFzKqkkdyPUgSGgzWZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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